Hierarchical structure analysis on disaster evolution of gas pipeline in karst area integrating disaster system and D/I model
In order to clarify the hierarchical structure of multi-factor disaster evolution of gas pipeline in karst area,based on the theory of disaster system,it was decomposed into four subsystems:disaster pregnant environment,disaster factor,disaster bearing body and disaster condition.By combining the DEMATEL method and ISM model,the logical hierarchy and causal progressive relationship of multi-factor disaster evolution were analyzed.Therefore,the multi-level hierarchical structure model was established,and the key points of risk management and control were clarified.The results show that the risk factors of dis-aster system are distributed in multiple levels,which form the differentiated action paths and heterogeneous influencing effect.The surface direct factors such as the length and width of karst collapse have a direct influence on the disaster evolution,which is the first priority of risk management and control.The middle indirect factors such as the characteristics of karst over-burden and topography play a connecting role in the disaster system.The deep fundamental factors such as structural condi-tions and fire sources are located at the bottom of multi-level hierarchical structure,and the evolution and development of dis-aster can be essentially curbed only by the effective management and control on them.The research results can provide guid-ance for the disaster prevention and mitigation of gas pipeline engineering in karst geological hazard areas.